drivers/iio/light/ltr501.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ltr501.c - Support for Lite-On LTR501 ambient light and proximity sensor
   4  *
   5  * Copyright 2014 Peter Meerwald <pmeerw@pmeerw.net>
   6  *
   7  * 7-bit I2C slave address 0x23
   8  *
   9  * TODO: IR LED characteristics
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/i2c.h>
  14 #include <linux/err.h>
  15 #include <linux/delay.h>
  16 #include <linux/regmap.h>
  17 #include <linux/acpi.h>
  18
  19 #include <linux/iio/iio.h>
  20 #include <linux/iio/events.h>
  21 #include <linux/iio/sysfs.h>
  22 #include <linux/iio/trigger_consumer.h>
  23 #include <linux/iio/buffer.h>
  24 #include <linux/iio/triggered_buffer.h>
  25
  26 #define LTR501_DRV_NAME "ltr501"
  27
  28 #define LTR501_ALS_CONTR 0x80 /* ALS operation mode, SW reset */
  29 #define LTR501_PS_CONTR 0x81 /* PS operation mode */
  30 #define LTR501_PS_MEAS_RATE 0x84 /* measurement rate*/
  31 #define LTR501_ALS_MEAS_RATE 0x85 /* ALS integ time, measurement rate*/
  32 #define LTR501_PART_ID 0x86
  33 #define LTR501_MANUFAC_ID 0x87
  34 #define LTR501_ALS_DATA1 0x88 /* 16-bit, little endian */
  35 #define LTR501_ALS_DATA1_UPPER 0x89 /* upper 8 bits of LTR501_ALS_DATA1 */
  36 #define LTR501_ALS_DATA0 0x8a /* 16-bit, little endian */
  37 #define LTR501_ALS_DATA0_UPPER 0x8b /* upper 8 bits of LTR501_ALS_DATA0 */
  38 #define LTR501_ALS_PS_STATUS 0x8c
  39 #define LTR501_PS_DATA 0x8d /* 16-bit, little endian */
  40 #define LTR501_PS_DATA_UPPER 0x8e /* upper 8 bits of LTR501_PS_DATA */
  41 #define LTR501_INTR 0x8f /* output mode, polarity, mode */
  42 #define LTR501_PS_THRESH_UP 0x90 /* 11 bit, ps upper threshold */
  43 #define LTR501_PS_THRESH_LOW 0x92 /* 11 bit, ps lower threshold */
  44 #define LTR501_ALS_THRESH_UP 0x97 /* 16 bit, ALS upper threshold */
  45 #define LTR501_ALS_THRESH_LOW 0x99 /* 16 bit, ALS lower threshold */
  46 #define LTR501_INTR_PRST 0x9e /* ps thresh, als thresh */
  47 #define LTR501_MAX_REG 0x9f
  48
  49 #define LTR501_ALS_CONTR_SW_RESET BIT(2)
  50 #define LTR501_CONTR_PS_GAIN_MASK (BIT(3) | BIT(2))
  51 #define LTR501_CONTR_PS_GAIN_SHIFT 2
  52 #define LTR501_CONTR_ALS_GAIN_MASK BIT(3)
  53 #define LTR501_CONTR_ACTIVE BIT(1)
  54
  55 #define LTR501_STATUS_ALS_INTR BIT(3)
  56 #define LTR501_STATUS_ALS_RDY BIT(2)
  57 #define LTR501_STATUS_PS_INTR BIT(1)
  58 #define LTR501_STATUS_PS_RDY BIT(0)
  59
  60 #define LTR501_PS_DATA_MASK 0x7ff
  61 #define LTR501_PS_THRESH_MASK 0x7ff
  62 #define LTR501_ALS_THRESH_MASK 0xffff
  63
  64 #define LTR501_ALS_DEF_PERIOD 500000
  65 #define LTR501_PS_DEF_PERIOD 100000
  66
  67 #define LTR501_REGMAP_NAME "ltr501_regmap"
  68
  69 #define LTR501_LUX_CONV(vis_coeff, vis_data, ir_coeff, ir_data) \
  70                         ((vis_coeff * vis_data) - (ir_coeff * ir_data))
  71
  72 static const int int_time_mapping[] = {100000, 50000, 200000, 400000};
  73
  74 static const struct reg_field reg_field_it =
  75                                 REG_FIELD(LTR501_ALS_MEAS_RATE, 3, 4);
  76 static const struct reg_field reg_field_als_intr =
  77                                 REG_FIELD(LTR501_INTR, 1, 1);
  78 static const struct reg_field reg_field_ps_intr =
  79                                 REG_FIELD(LTR501_INTR, 0, 0);
  80 static const struct reg_field reg_field_als_rate =
  81                                 REG_FIELD(LTR501_ALS_MEAS_RATE, 0, 2);
  82 static const struct reg_field reg_field_ps_rate =
  83                                 REG_FIELD(LTR501_PS_MEAS_RATE, 0, 3);
  84 static const struct reg_field reg_field_als_prst =
  85                                 REG_FIELD(LTR501_INTR_PRST, 0, 3);
  86 static const struct reg_field reg_field_ps_prst =
  87                                 REG_FIELD(LTR501_INTR_PRST, 4, 7);
  88
  89 struct ltr501_samp_table {
  90         int freq_val;  /* repetition frequency in micro HZ*/
  91         int time_val; /* repetition rate in micro seconds */
  92 };
  93
  94 #define LTR501_RESERVED_GAIN -1
  95
  96 enum {
  97         ltr501 = 0,
  98         ltr559,
  99         ltr301,
 100 };
 101
 102 struct ltr501_gain {
 103         int scale;
 104         int uscale;
 105 };
 106
 107 static const struct ltr501_gain ltr501_als_gain_tbl[] = {
 108         {1, 0},
 109         {0, 5000},
 110 };
 111
 112 static const struct ltr501_gain ltr559_als_gain_tbl[] = {
 113         {1, 0},
 114         {0, 500000},
 115         {0, 250000},
 116         {0, 125000},
 117         {LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN},
 118         {LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN},
 119         {0, 20000},
 120         {0, 10000},
 121 };
 122
 123 static const struct ltr501_gain ltr501_ps_gain_tbl[] = {
 124         {1, 0},
 125         {0, 250000},
 126         {0, 125000},
 127         {0, 62500},
 128 };
 129
 130 static const struct ltr501_gain ltr559_ps_gain_tbl[] = {
 131         {0, 62500}, /* x16 gain */
 132         {0, 31250}, /* x32 gain */
 133         {0, 15625}, /* bits X1 are for x64 gain */
 134         {0, 15624},
 135 };
 136
 137 struct ltr501_chip_info {
 138         u8 partid;
 139         const struct ltr501_gain *als_gain;
 140         int als_gain_tbl_size;
 141         const struct ltr501_gain *ps_gain;
 142         int ps_gain_tbl_size;
 143         u8 als_mode_active;
 144         u8 als_gain_mask;
 145         u8 als_gain_shift;
 146         struct iio_chan_spec const *channels;
 147         const int no_channels;
 148         const struct iio_info *info;
 149         const struct iio_info *info_no_irq;
 150 };
 151
 152 struct ltr501_data {
 153         struct i2c_client *client;
 154         struct mutex lock_als, lock_ps;
 155         const struct ltr501_chip_info *chip_info;
 156         u8 als_contr, ps_contr;
 157         int als_period, ps_period; /* period in micro seconds */
 158         struct regmap *regmap;
 159         struct regmap_field *reg_it;
 160         struct regmap_field *reg_als_intr;
 161         struct regmap_field *reg_ps_intr;
 162         struct regmap_field *reg_als_rate;
 163         struct regmap_field *reg_ps_rate;
 164         struct regmap_field *reg_als_prst;
 165         struct regmap_field *reg_ps_prst;
 166 };
 167
 168 static const struct ltr501_samp_table ltr501_als_samp_table[] = {
 169                         {20000000, 50000}, {10000000, 100000},
 170                         {5000000, 200000}, {2000000, 500000},
 171                         {1000000, 1000000}, {500000, 2000000},
 172                         {500000, 2000000}, {500000, 2000000}
 173 };
 174
 175 static const struct ltr501_samp_table ltr501_ps_samp_table[] = {
 176                         {20000000, 50000}, {14285714, 70000},
 177                         {10000000, 100000}, {5000000, 200000},
 178                         {2000000, 500000}, {1000000, 1000000},
 179                         {500000, 2000000}, {500000, 2000000},
 180                         {500000, 2000000}
 181 };
 182
 183 static int ltr501_match_samp_freq(const struct ltr501_samp_table *tab,
 184                                            int len, int val, int val2)
 185 {
 186         int i, freq;
 187
 188         freq = val * 1000000 + val2;
 189
 190         for (i = 0; i < len; i++) {
 191                 if (tab[i].freq_val == freq)
 192                         return i;
 193         }
 194
 195         return -EINVAL;
 196 }
 197
 198 static int ltr501_als_read_samp_freq(const struct ltr501_data *data,
 199                                      int *val, int *val2)
 200 {
 201         int ret, i;
 202
 203         ret = regmap_field_read(data->reg_als_rate, &i);
 204         if (ret < 0)
 205                 return ret;
 206
 207         if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table))
 208                 return -EINVAL;
 209
 210         *val = ltr501_als_samp_table[i].freq_val / 1000000;
 211         *val2 = ltr501_als_samp_table[i].freq_val % 1000000;
 212
 213         return IIO_VAL_INT_PLUS_MICRO;
 214 }
 215
 216 static int ltr501_ps_read_samp_freq(const struct ltr501_data *data,
 217                                     int *val, int *val2)
 218 {
 219         int ret, i;
 220
 221         ret = regmap_field_read(data->reg_ps_rate, &i);
 222         if (ret < 0)
 223                 return ret;
 224
 225         if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table))
 226                 return -EINVAL;
 227
 228         *val = ltr501_ps_samp_table[i].freq_val / 1000000;
 229         *val2 = ltr501_ps_samp_table[i].freq_val % 1000000;
 230
 231         return IIO_VAL_INT_PLUS_MICRO;
 232 }
 233
 234 static int ltr501_als_write_samp_freq(struct ltr501_data *data,
 235                                       int val, int val2)
 236 {
 237         int i, ret;
 238
 239         i = ltr501_match_samp_freq(ltr501_als_samp_table,
 240                                    ARRAY_SIZE(ltr501_als_samp_table),
 241                                    val, val2);
 242
 243         if (i < 0)
 244                 return i;
 245
 246         mutex_lock(&data->lock_als);
 247         ret = regmap_field_write(data->reg_als_rate, i);
 248         mutex_unlock(&data->lock_als);
 249
 250         return ret;
 251 }
 252
 253 static int ltr501_ps_write_samp_freq(struct ltr501_data *data,
 254                                      int val, int val2)
 255 {
 256         int i, ret;
 257
 258         i = ltr501_match_samp_freq(ltr501_ps_samp_table,
 259                                    ARRAY_SIZE(ltr501_ps_samp_table),
 260                                    val, val2);
 261
 262         if (i < 0)
 263                 return i;
 264
 265         mutex_lock(&data->lock_ps);
 266         ret = regmap_field_write(data->reg_ps_rate, i);
 267         mutex_unlock(&data->lock_ps);
 268
 269         return ret;
 270 }
 271
 272 static int ltr501_als_read_samp_period(const struct ltr501_data *data, int *val)
 273 {
 274         int ret, i;
 275
 276         ret = regmap_field_read(data->reg_als_rate, &i);
 277         if (ret < 0)
 278                 return ret;
 279
 280         if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table))
 281                 return -EINVAL;
 282
 283         *val = ltr501_als_samp_table[i].time_val;
 284
 285         return IIO_VAL_INT;
 286 }
 287
 288 static int ltr501_ps_read_samp_period(const struct ltr501_data *data, int *val)
 289 {
 290         int ret, i;
 291
 292         ret = regmap_field_read(data->reg_ps_rate, &i);
 293         if (ret < 0)
 294                 return ret;
 295
 296         if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table))
 297                 return -EINVAL;
 298
 299         *val = ltr501_ps_samp_table[i].time_val;
 300
 301         return IIO_VAL_INT;
 302 }
 303
 304 /* IR and visible spectrum coeff's are given in data sheet */
 305 static unsigned long ltr501_calculate_lux(u16 vis_data, u16 ir_data)
 306 {
 307         unsigned long ratio, lux;
 308
 309         if (vis_data == 0)
 310                 return 0;
 311
 312         /* multiply numerator by 100 to avoid handling ratio < 1 */
 313         ratio = DIV_ROUND_UP(ir_data * 100, ir_data + vis_data);
 314
 315         if (ratio < 45)
 316                 lux = LTR501_LUX_CONV(1774, vis_data, -1105, ir_data);
 317         else if (ratio >= 45 && ratio < 64)
 318                 lux = LTR501_LUX_CONV(3772, vis_data, 1336, ir_data);
 319         else if (ratio >= 64 && ratio < 85)
 320                 lux = LTR501_LUX_CONV(1690, vis_data, 169, ir_data);
 321         else
 322                 lux = 0;
 323
 324         return lux / 1000;
 325 }
 326
 327 static int ltr501_drdy(const struct ltr501_data *data, u8 drdy_mask)
 328 {
 329         int tries = 100;
 330         int ret, status;
 331
 332         while (tries--) {
 333                 ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status);
 334                 if (ret < 0)
 335                         return ret;
 336                 if ((status & drdy_mask) == drdy_mask)
 337                         return 0;
 338                 msleep(25);
 339         }
 340
 341         dev_err(&data->client->dev, "ltr501_drdy() failed, data not ready\n");
 342         return -EIO;
 343 }
 344
 345 static int ltr501_set_it_time(struct ltr501_data *data, int it)
 346 {
 347         int ret, i, index = -1, status;
 348
 349         for (i = 0; i < ARRAY_SIZE(int_time_mapping); i++) {
 350                 if (int_time_mapping[i] == it) {
 351                         index = i;
 352                         break;
 353                 }
 354         }
 355         /* Make sure integ time index is valid */
 356         if (index < 0)
 357                 return -EINVAL;
 358
 359         ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status);
 360         if (ret < 0)
 361                 return ret;
 362
 363         if (status & LTR501_CONTR_ALS_GAIN_MASK) {
 364                 /*
 365                  * 200 ms and 400 ms integ time can only be
 366                  * used in dynamic range 1
 367                  */
 368                 if (index > 1)
 369                         return -EINVAL;
 370         } else
 371                 /* 50 ms integ time can only be used in dynamic range 2 */
 372                 if (index == 1)
 373                         return -EINVAL;
 374
 375         return regmap_field_write(data->reg_it, index);
 376 }
 377
 378 /* read int time in micro seconds */
 379 static int ltr501_read_it_time(const struct ltr501_data *data,
 380                                int *val, int *val2)
 381 {
 382         int ret, index;
 383
 384         ret = regmap_field_read(data->reg_it, &index);
 385         if (ret < 0)
 386                 return ret;
 387
 388         /* Make sure integ time index is valid */
 389         if (index < 0 || index >= ARRAY_SIZE(int_time_mapping))
 390                 return -EINVAL;
 391
 392         *val2 = int_time_mapping[index];
 393         *val = 0;
 394
 395         return IIO_VAL_INT_PLUS_MICRO;
 396 }
 397
 398 static int ltr501_read_als(const struct ltr501_data *data, __le16 buf[2])
 399 {
 400         int ret;
 401
 402         ret = ltr501_drdy(data, LTR501_STATUS_ALS_RDY);
 403         if (ret < 0)
 404                 return ret;
 405         /* always read both ALS channels in given order */
 406         return regmap_bulk_read(data->regmap, LTR501_ALS_DATA1,
 407                                 buf, 2 * sizeof(__le16));
 408 }
 409
 410 static int ltr501_read_ps(const struct ltr501_data *data)
 411 {
 412         __le16 status;
 413         int ret;
 414
 415         ret = ltr501_drdy(data, LTR501_STATUS_PS_RDY);
 416         if (ret < 0)
 417                 return ret;
 418
 419         ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA,
 420                                &status, sizeof(status));
 421         if (ret < 0)
 422                 return ret;
 423
 424         return le16_to_cpu(status);
 425 }
 426
 427 static int ltr501_read_intr_prst(const struct ltr501_data *data,
 428                                  enum iio_chan_type type,
 429                                  int *val2)
 430 {
 431         int ret, samp_period, prst;
 432
 433         switch (type) {
 434         case IIO_INTENSITY:
 435                 ret = regmap_field_read(data->reg_als_prst, &prst);
 436                 if (ret < 0)
 437                         return ret;
 438
 439                 ret = ltr501_als_read_samp_period(data, &samp_period);
 440
 441                 if (ret < 0)
 442                         return ret;
 443                 *val2 = samp_period * prst;
 444                 return IIO_VAL_INT_PLUS_MICRO;
 445         case IIO_PROXIMITY:
 446                 ret = regmap_field_read(data->reg_ps_prst, &prst);
 447                 if (ret < 0)
 448                         return ret;
 449
 450                 ret = ltr501_ps_read_samp_period(data, &samp_period);
 451
 452                 if (ret < 0)
 453                         return ret;
 454
 455                 *val2 = samp_period * prst;
 456                 return IIO_VAL_INT_PLUS_MICRO;
 457         default:
 458                 return -EINVAL;
 459         }
 460
 461         return -EINVAL;
 462 }
 463
 464 static int ltr501_write_intr_prst(struct ltr501_data *data,
 465                                   enum iio_chan_type type,
 466                                   int val, int val2)
 467 {
 468         int ret, samp_period, new_val;
 469         unsigned long period;
 470
 471         if (val < 0 || val2 < 0)
 472                 return -EINVAL;
 473
 474         /* period in microseconds */
 475         period = ((val * 1000000) + val2);
 476
 477         switch (type) {
 478         case IIO_INTENSITY:
 479                 ret = ltr501_als_read_samp_period(data, &samp_period);
 480                 if (ret < 0)
 481                         return ret;
 482
 483                 /* period should be atleast equal to sampling period */
 484                 if (period < samp_period)
 485                         return -EINVAL;
 486
 487                 new_val = DIV_ROUND_UP(period, samp_period);
 488                 if (new_val < 0 || new_val > 0x0f)
 489                         return -EINVAL;
 490
 491                 mutex_lock(&data->lock_als);
 492                 ret = regmap_field_write(data->reg_als_prst, new_val);
 493                 mutex_unlock(&data->lock_als);
 494                 if (ret >= 0)
 495                         data->als_period = period;
 496
 497                 return ret;
 498         case IIO_PROXIMITY:
 499                 ret = ltr501_ps_read_samp_period(data, &samp_period);
 500                 if (ret < 0)
 501                         return ret;
 502
 503                 /* period should be atleast equal to rate */
 504                 if (period < samp_period)
 505                         return -EINVAL;
 506
 507                 new_val = DIV_ROUND_UP(period, samp_period);
 508                 if (new_val < 0 || new_val > 0x0f)
 509                         return -EINVAL;
 510
 511                 mutex_lock(&data->lock_ps);
 512                 ret = regmap_field_write(data->reg_ps_prst, new_val);
 513                 mutex_unlock(&data->lock_ps);
 514                 if (ret >= 0)
 515                         data->ps_period = period;
 516
 517                 return ret;
 518         default:
 519                 return -EINVAL;
 520         }
 521
 522         return -EINVAL;
 523 }
 524
 525 static const struct iio_event_spec ltr501_als_event_spec[] = {
 526         {
 527                 .type = IIO_EV_TYPE_THRESH,
 528                 .dir = IIO_EV_DIR_RISING,
 529                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
 530         }, {
 531                 .type = IIO_EV_TYPE_THRESH,
 532                 .dir = IIO_EV_DIR_FALLING,
 533                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
 534         }, {
 535                 .type = IIO_EV_TYPE_THRESH,
 536                 .dir = IIO_EV_DIR_EITHER,
 537                 .mask_separate = BIT(IIO_EV_INFO_ENABLE) |
 538                                  BIT(IIO_EV_INFO_PERIOD),
 539         },
 540
 541 };
 542
 543 static const struct iio_event_spec ltr501_pxs_event_spec[] = {
 544         {
 545                 .type = IIO_EV_TYPE_THRESH,
 546                 .dir = IIO_EV_DIR_RISING,
 547                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
 548         }, {
 549                 .type = IIO_EV_TYPE_THRESH,
 550                 .dir = IIO_EV_DIR_FALLING,
 551                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
 552         }, {
 553                 .type = IIO_EV_TYPE_THRESH,
 554                 .dir = IIO_EV_DIR_EITHER,
 555                 .mask_separate = BIT(IIO_EV_INFO_ENABLE) |
 556                                  BIT(IIO_EV_INFO_PERIOD),
 557         },
 558 };
 559
 560 #define LTR501_INTENSITY_CHANNEL(_idx, _addr, _mod, _shared, \
 561                                  _evspec, _evsize) { \
 562         .type = IIO_INTENSITY, \
 563         .modified = 1, \
 564         .address = (_addr), \
 565         .channel2 = (_mod), \
 566         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 567         .info_mask_shared_by_type = (_shared), \
 568         .scan_index = (_idx), \
 569         .scan_type = { \
 570                 .sign = 'u', \
 571                 .realbits = 16, \
 572                 .storagebits = 16, \
 573                 .endianness = IIO_CPU, \
 574         }, \
 575         .event_spec = _evspec,\
 576         .num_event_specs = _evsize,\
 577 }
 578
 579 #define LTR501_LIGHT_CHANNEL() { \
 580         .type = IIO_LIGHT, \
 581         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
 582         .scan_index = -1, \
 583 }
 584
 585 static const struct iio_chan_spec ltr501_channels[] = {
 586         LTR501_LIGHT_CHANNEL(),
 587         LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0,
 588                                  ltr501_als_event_spec,
 589                                  ARRAY_SIZE(ltr501_als_event_spec)),
 590         LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR,
 591                                  BIT(IIO_CHAN_INFO_SCALE) |
 592                                  BIT(IIO_CHAN_INFO_INT_TIME) |
 593                                  BIT(IIO_CHAN_INFO_SAMP_FREQ),
 594                                  NULL, 0),
 595         {
 596                 .type = IIO_PROXIMITY,
 597                 .address = LTR501_PS_DATA,
 598                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 599                         BIT(IIO_CHAN_INFO_SCALE),
 600                 .scan_index = 2,
 601                 .scan_type = {
 602                         .sign = 'u',
 603                         .realbits = 11,
 604                         .storagebits = 16,
 605                         .endianness = IIO_CPU,
 606                 },
 607                 .event_spec = ltr501_pxs_event_spec,
 608                 .num_event_specs = ARRAY_SIZE(ltr501_pxs_event_spec),
 609         },
 610         IIO_CHAN_SOFT_TIMESTAMP(3),
 611 };
 612
 613 static const struct iio_chan_spec ltr301_channels[] = {
 614         LTR501_LIGHT_CHANNEL(),
 615         LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0,
 616                                  ltr501_als_event_spec,
 617                                  ARRAY_SIZE(ltr501_als_event_spec)),
 618         LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR,
 619                                  BIT(IIO_CHAN_INFO_SCALE) |
 620                                  BIT(IIO_CHAN_INFO_INT_TIME) |
 621                                  BIT(IIO_CHAN_INFO_SAMP_FREQ),
 622                                  NULL, 0),
 623         IIO_CHAN_SOFT_TIMESTAMP(2),
 624 };
 625
 626 static int ltr501_read_raw(struct iio_dev *indio_dev,
 627                            struct iio_chan_spec const *chan,
 628                            int *val, int *val2, long mask)
 629 {
 630         struct ltr501_data *data = iio_priv(indio_dev);
 631         __le16 buf[2];
 632         int ret, i;
 633
 634         switch (mask) {
 635         case IIO_CHAN_INFO_PROCESSED:
 636                 switch (chan->type) {
 637                 case IIO_LIGHT:
 638                         ret = iio_device_claim_direct_mode(indio_dev);
 639                         if (ret)
 640                                 return ret;
 641
 642                         mutex_lock(&data->lock_als);
 643                         ret = ltr501_read_als(data, buf);
 644                         mutex_unlock(&data->lock_als);
 645                         iio_device_release_direct_mode(indio_dev);
 646                         if (ret < 0)
 647                                 return ret;
 648                         *val = ltr501_calculate_lux(le16_to_cpu(buf[1]),
 649                                                     le16_to_cpu(buf[0]));
 650                         return IIO_VAL_INT;
 651                 default:
 652                         return -EINVAL;
 653                 }
 654         case IIO_CHAN_INFO_RAW:
 655                 ret = iio_device_claim_direct_mode(indio_dev);
 656                 if (ret)
 657                         return ret;
 658
 659                 switch (chan->type) {
 660                 case IIO_INTENSITY:
 661                         mutex_lock(&data->lock_als);
 662                         ret = ltr501_read_als(data, buf);
 663                         mutex_unlock(&data->lock_als);
 664                         if (ret < 0)
 665                                 break;
 666                         *val = le16_to_cpu(chan->address == LTR501_ALS_DATA1 ?
 667                                            buf[0] : buf[1]);
 668                         ret = IIO_VAL_INT;
 669                         break;
 670                 case IIO_PROXIMITY:
 671                         mutex_lock(&data->lock_ps);
 672                         ret = ltr501_read_ps(data);
 673                         mutex_unlock(&data->lock_ps);
 674                         if (ret < 0)
 675                                 break;
 676                         *val = ret & LTR501_PS_DATA_MASK;
 677                         ret = IIO_VAL_INT;
 678                         break;
 679                 default:
 680                         ret = -EINVAL;
 681                         break;
 682                 }
 683
 684                 iio_device_release_direct_mode(indio_dev);
 685                 return ret;
 686
 687         case IIO_CHAN_INFO_SCALE:
 688                 switch (chan->type) {
 689                 case IIO_INTENSITY:
 690                         i = (data->als_contr & data->chip_info->als_gain_mask)
 691                              >> data->chip_info->als_gain_shift;
 692                         *val = data->chip_info->als_gain[i].scale;
 693                         *val2 = data->chip_info->als_gain[i].uscale;
 694                         return IIO_VAL_INT_PLUS_MICRO;
 695                 case IIO_PROXIMITY:
 696                         i = (data->ps_contr & LTR501_CONTR_PS_GAIN_MASK) >>
 697                                 LTR501_CONTR_PS_GAIN_SHIFT;
 698                         *val = data->chip_info->ps_gain[i].scale;
 699                         *val2 = data->chip_info->ps_gain[i].uscale;
 700                         return IIO_VAL_INT_PLUS_MICRO;
 701                 default:
 702                         return -EINVAL;
 703                 }
 704         case IIO_CHAN_INFO_INT_TIME:
 705                 switch (chan->type) {
 706                 case IIO_INTENSITY:
 707                         return ltr501_read_it_time(data, val, val2);
 708                 default:
 709                         return -EINVAL;
 710                 }
 711         case IIO_CHAN_INFO_SAMP_FREQ:
 712                 switch (chan->type) {
 713                 case IIO_INTENSITY:
 714                         return ltr501_als_read_samp_freq(data, val, val2);
 715                 case IIO_PROXIMITY:
 716                         return ltr501_ps_read_samp_freq(data, val, val2);
 717                 default:
 718                         return -EINVAL;
 719                 }
 720         }
 721         return -EINVAL;
 722 }
 723
 724 static int ltr501_get_gain_index(const struct ltr501_gain *gain, int size,
 725                                  int val, int val2)
 726 {
 727         int i;
 728
 729         for (i = 0; i < size; i++)
 730                 if (val == gain[i].scale && val2 == gain[i].uscale)
 731                         return i;
 732
 733         return -1;
 734 }
 735
 736 static int ltr501_write_raw(struct iio_dev *indio_dev,
 737                             struct iio_chan_spec const *chan,
 738                             int val, int val2, long mask)
 739 {
 740         struct ltr501_data *data = iio_priv(indio_dev);
 741         int i, ret, freq_val, freq_val2;
 742         const struct ltr501_chip_info *info = data->chip_info;
 743
 744         ret = iio_device_claim_direct_mode(indio_dev);
 745         if (ret)
 746                 return ret;
 747
 748         switch (mask) {
 749         case IIO_CHAN_INFO_SCALE:
 750                 switch (chan->type) {
 751                 case IIO_INTENSITY:
 752                         i = ltr501_get_gain_index(info->als_gain,
 753                                                   info->als_gain_tbl_size,
 754                                                   val, val2);
 755                         if (i < 0) {
 756                                 ret = -EINVAL;
 757                                 break;
 758                         }
 759
 760                         data->als_contr &= ~info->als_gain_mask;
 761                         data->als_contr |= i << info->als_gain_shift;
 762
 763                         ret = regmap_write(data->regmap, LTR501_ALS_CONTR,
 764                                            data->als_contr);
 765                         break;
 766                 case IIO_PROXIMITY:
 767                         i = ltr501_get_gain_index(info->ps_gain,
 768                                                   info->ps_gain_tbl_size,
 769                                                   val, val2);
 770                         if (i < 0) {
 771                                 ret = -EINVAL;
 772                                 break;
 773                         }
 774                         data->ps_contr &= ~LTR501_CONTR_PS_GAIN_MASK;
 775                         data->ps_contr |= i << LTR501_CONTR_PS_GAIN_SHIFT;
 776
 777                         ret = regmap_write(data->regmap, LTR501_PS_CONTR,
 778                                            data->ps_contr);
 779                         break;
 780                 default:
 781                         ret = -EINVAL;
 782                         break;
 783                 }
 784                 break;
 785
 786         case IIO_CHAN_INFO_INT_TIME:
 787                 switch (chan->type) {
 788                 case IIO_INTENSITY:
 789                         if (val != 0) {
 790                                 ret = -EINVAL;
 791                                 break;
 792                         }
 793                         mutex_lock(&data->lock_als);
 794                         ret = ltr501_set_it_time(data, val2);
 795                         mutex_unlock(&data->lock_als);
 796                         break;
 797                 default:
 798                         ret = -EINVAL;
 799                         break;
 800                 }
 801                 break;
 802
 803         case IIO_CHAN_INFO_SAMP_FREQ:
 804                 switch (chan->type) {
 805                 case IIO_INTENSITY:
 806                         ret = ltr501_als_read_samp_freq(data, &freq_val,
 807                                                         &freq_val2);
 808                         if (ret < 0)
 809                                 break;
 810
 811                         ret = ltr501_als_write_samp_freq(data, val, val2);
 812                         if (ret < 0)
 813                                 break;
 814
 815                         /* update persistence count when changing frequency */
 816                         ret = ltr501_write_intr_prst(data, chan->type,
 817                                                      0, data->als_period);
 818
 819                         if (ret < 0)
 820                                 ret = ltr501_als_write_samp_freq(data, freq_val,
 821                                                                  freq_val2);
 822                         break;
 823                 case IIO_PROXIMITY:
 824                         ret = ltr501_ps_read_samp_freq(data, &freq_val,
 825                                                        &freq_val2);
 826                         if (ret < 0)
 827                                 break;
 828
 829                         ret = ltr501_ps_write_samp_freq(data, val, val2);
 830                         if (ret < 0)
 831                                 break;
 832
 833                         /* update persistence count when changing frequency */
 834                         ret = ltr501_write_intr_prst(data, chan->type,
 835                                                      0, data->ps_period);
 836
 837                         if (ret < 0)
 838                                 ret = ltr501_ps_write_samp_freq(data, freq_val,
 839                                                                 freq_val2);
 840                         break;
 841                 default:
 842                         ret = -EINVAL;
 843                         break;
 844                 }
 845                 break;
 846
 847         default:
 848                 ret = -EINVAL;
 849                 break;
 850         }
 851
 852         iio_device_release_direct_mode(indio_dev);
 853         return ret;
 854 }
 855
 856 static int ltr501_read_thresh(const struct iio_dev *indio_dev,
 857                               const struct iio_chan_spec *chan,
 858                               enum iio_event_type type,
 859                               enum iio_event_direction dir,
 860                               enum iio_event_info info,
 861                               int *val, int *val2)
 862 {
 863         const struct ltr501_data *data = iio_priv(indio_dev);
 864         int ret, thresh_data;
 865
 866         switch (chan->type) {
 867         case IIO_INTENSITY:
 868                 switch (dir) {
 869                 case IIO_EV_DIR_RISING:
 870                         ret = regmap_bulk_read(data->regmap,
 871                                                LTR501_ALS_THRESH_UP,
 872                                                &thresh_data, 2);
 873                         if (ret < 0)
 874                                 return ret;
 875                         *val = thresh_data & LTR501_ALS_THRESH_MASK;
 876                         return IIO_VAL_INT;
 877                 case IIO_EV_DIR_FALLING:
 878                         ret = regmap_bulk_read(data->regmap,
 879                                                LTR501_ALS_THRESH_LOW,
 880                                                &thresh_data, 2);
 881                         if (ret < 0)
 882                                 return ret;
 883                         *val = thresh_data & LTR501_ALS_THRESH_MASK;
 884                         return IIO_VAL_INT;
 885                 default:
 886                         return -EINVAL;
 887                 }
 888         case IIO_PROXIMITY:
 889                 switch (dir) {
 890                 case IIO_EV_DIR_RISING:
 891                         ret = regmap_bulk_read(data->regmap,
 892                                                LTR501_PS_THRESH_UP,
 893                                                &thresh_data, 2);
 894                         if (ret < 0)
 895                                 return ret;
 896                         *val = thresh_data & LTR501_PS_THRESH_MASK;
 897                         return IIO_VAL_INT;
 898                 case IIO_EV_DIR_FALLING:
 899                         ret = regmap_bulk_read(data->regmap,
 900                                                LTR501_PS_THRESH_LOW,
 901                                                &thresh_data, 2);
 902                         if (ret < 0)
 903                                 return ret;
 904                         *val = thresh_data & LTR501_PS_THRESH_MASK;
 905                         return IIO_VAL_INT;
 906                 default:
 907                         return -EINVAL;
 908                 }
 909         default:
 910                 return -EINVAL;
 911         }
 912
 913         return -EINVAL;
 914 }
 915
 916 static int ltr501_write_thresh(struct iio_dev *indio_dev,
 917                                const struct iio_chan_spec *chan,
 918                                enum iio_event_type type,
 919                                enum iio_event_direction dir,
 920                                enum iio_event_info info,
 921                                int val, int val2)
 922 {
 923         struct ltr501_data *data = iio_priv(indio_dev);
 924         int ret;
 925
 926         if (val < 0)
 927                 return -EINVAL;
 928
 929         switch (chan->type) {
 930         case IIO_INTENSITY:
 931                 if (val > LTR501_ALS_THRESH_MASK)
 932                         return -EINVAL;
 933                 switch (dir) {
 934                 case IIO_EV_DIR_RISING:
 935                         mutex_lock(&data->lock_als);
 936                         ret = regmap_bulk_write(data->regmap,
 937                                                 LTR501_ALS_THRESH_UP,
 938                                                 &val, 2);
 939                         mutex_unlock(&data->lock_als);
 940                         return ret;
 941                 case IIO_EV_DIR_FALLING:
 942                         mutex_lock(&data->lock_als);
 943                         ret = regmap_bulk_write(data->regmap,
 944                                                 LTR501_ALS_THRESH_LOW,
 945                                                 &val, 2);
 946                         mutex_unlock(&data->lock_als);
 947                         return ret;
 948                 default:
 949                         return -EINVAL;
 950                 }
 951         case IIO_PROXIMITY:
 952                 if (val > LTR501_PS_THRESH_MASK)
 953                         return -EINVAL;
 954                 switch (dir) {
 955                 case IIO_EV_DIR_RISING:
 956                         mutex_lock(&data->lock_ps);
 957                         ret = regmap_bulk_write(data->regmap,
 958                                                 LTR501_PS_THRESH_UP,
 959                                                 &val, 2);
 960                         mutex_unlock(&data->lock_ps);
 961                         return ret;
 962                 case IIO_EV_DIR_FALLING:
 963                         mutex_lock(&data->lock_ps);
 964                         ret = regmap_bulk_write(data->regmap,
 965                                                 LTR501_PS_THRESH_LOW,
 966                                                 &val, 2);
 967                         mutex_unlock(&data->lock_ps);
 968                         return ret;
 969                 default:
 970                         return -EINVAL;
 971                 }
 972         default:
 973                 return -EINVAL;
 974         }
 975
 976         return -EINVAL;
 977 }
 978
 979 static int ltr501_read_event(struct iio_dev *indio_dev,
 980                              const struct iio_chan_spec *chan,
 981                              enum iio_event_type type,
 982                              enum iio_event_direction dir,
 983                              enum iio_event_info info,
 984                              int *val, int *val2)
 985 {
 986         int ret;
 987
 988         switch (info) {
 989         case IIO_EV_INFO_VALUE:
 990                 return ltr501_read_thresh(indio_dev, chan, type, dir,
 991                                           info, val, val2);
 992         case IIO_EV_INFO_PERIOD:
 993                 ret = ltr501_read_intr_prst(iio_priv(indio_dev),
 994                                             chan->type, val2);
 995                 *val = *val2 / 1000000;
 996                 *val2 = *val2 % 1000000;
 997                 return ret;
 998         default:
 999                 return -EINVAL;
1000         }
1001
1002         return -EINVAL;
1003 }
1004
1005 static int ltr501_write_event(struct iio_dev *indio_dev,
1006                               const struct iio_chan_spec *chan,
1007                               enum iio_event_type type,
1008                               enum iio_event_direction dir,
1009                               enum iio_event_info info,
1010                               int val, int val2)
1011 {
1012         switch (info) {
1013         case IIO_EV_INFO_VALUE:
1014                 if (val2 != 0)
1015                         return -EINVAL;
1016                 return ltr501_write_thresh(indio_dev, chan, type, dir,
1017                                            info, val, val2);
1018         case IIO_EV_INFO_PERIOD:
1019                 return ltr501_write_intr_prst(iio_priv(indio_dev), chan->type,
1020                                               val, val2);
1021         default:
1022                 return -EINVAL;
1023         }
1024
1025         return -EINVAL;
1026 }
1027
1028 static int ltr501_read_event_config(struct iio_dev *indio_dev,
1029                                     const struct iio_chan_spec *chan,
1030                                     enum iio_event_type type,
1031                                     enum iio_event_direction dir)
1032 {
1033         struct ltr501_data *data = iio_priv(indio_dev);
1034         int ret, status;
1035
1036         switch (chan->type) {
1037         case IIO_INTENSITY:
1038                 ret = regmap_field_read(data->reg_als_intr, &status);
1039                 if (ret < 0)
1040                         return ret;
1041                 return status;
1042         case IIO_PROXIMITY:
1043                 ret = regmap_field_read(data->reg_ps_intr, &status);
1044                 if (ret < 0)
1045                         return ret;
1046                 return status;
1047         default:
1048                 return -EINVAL;
1049         }
1050
1051         return -EINVAL;
1052 }
1053
1054 static int ltr501_write_event_config(struct iio_dev *indio_dev,
1055                                      const struct iio_chan_spec *chan,
1056                                      enum iio_event_type type,
1057                                      enum iio_event_direction dir, int state)
1058 {
1059         struct ltr501_data *data = iio_priv(indio_dev);
1060         int ret;
1061
1062         /* only 1 and 0 are valid inputs */
1063         if (state != 1  && state != 0)
1064                 return -EINVAL;
1065
1066         switch (chan->type) {
1067         case IIO_INTENSITY:
1068                 mutex_lock(&data->lock_als);
1069                 ret = regmap_field_write(data->reg_als_intr, state);
1070                 mutex_unlock(&data->lock_als);
1071                 return ret;
1072         case IIO_PROXIMITY:
1073                 mutex_lock(&data->lock_ps);
1074                 ret = regmap_field_write(data->reg_ps_intr, state);
1075                 mutex_unlock(&data->lock_ps);
1076                 return ret;
1077         default:
1078                 return -EINVAL;
1079         }
1080
1081         return -EINVAL;
1082 }
1083
1084 static ssize_t ltr501_show_proximity_scale_avail(struct device *dev,
1085                                                  struct device_attribute *attr,
1086                                                  char *buf)
1087 {
1088         struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev));
1089         const struct ltr501_chip_info *info = data->chip_info;
1090         ssize_t len = 0;
1091         int i;
1092
1093         for (i = 0; i < info->ps_gain_tbl_size; i++) {
1094                 if (info->ps_gain[i].scale == LTR501_RESERVED_GAIN)
1095                         continue;
1096                 len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
1097                                  info->ps_gain[i].scale,
1098                                  info->ps_gain[i].uscale);
1099         }
1100
1101         buf[len - 1] = '\n';
1102
1103         return len;
1104 }
1105
1106 static ssize_t ltr501_show_intensity_scale_avail(struct device *dev,
1107                                                  struct device_attribute *attr,
1108                                                  char *buf)
1109 {
1110         struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev));
1111         const struct ltr501_chip_info *info = data->chip_info;
1112         ssize_t len = 0;
1113         int i;
1114
1115         for (i = 0; i < info->als_gain_tbl_size; i++) {
1116                 if (info->als_gain[i].scale == LTR501_RESERVED_GAIN)
1117                         continue;
1118                 len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
1119                                  info->als_gain[i].scale,
1120                                  info->als_gain[i].uscale);
1121         }
1122
1123         buf[len - 1] = '\n';
1124
1125         return len;
1126 }
1127
1128 static IIO_CONST_ATTR_INT_TIME_AVAIL("0.05 0.1 0.2 0.4");
1129 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("20 10 5 2 1 0.5");
1130
1131 static IIO_DEVICE_ATTR(in_proximity_scale_available, S_IRUGO,
1132                        ltr501_show_proximity_scale_avail, NULL, 0);
1133 static IIO_DEVICE_ATTR(in_intensity_scale_available, S_IRUGO,
1134                        ltr501_show_intensity_scale_avail, NULL, 0);
1135
1136 static struct attribute *ltr501_attributes[] = {
1137         &iio_dev_attr_in_proximity_scale_available.dev_attr.attr,
1138         &iio_dev_attr_in_intensity_scale_available.dev_attr.attr,
1139         &iio_const_attr_integration_time_available.dev_attr.attr,
1140         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
1141         NULL
1142 };
1143
1144 static struct attribute *ltr301_attributes[] = {
1145         &iio_dev_attr_in_intensity_scale_available.dev_attr.attr,
1146         &iio_const_attr_integration_time_available.dev_attr.attr,
1147         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
1148         NULL
1149 };
1150
1151 static const struct attribute_group ltr501_attribute_group = {
1152         .attrs = ltr501_attributes,
1153 };
1154
1155 static const struct attribute_group ltr301_attribute_group = {
1156         .attrs = ltr301_attributes,
1157 };
1158
1159 static const struct iio_info ltr501_info_no_irq = {
1160         .read_raw = ltr501_read_raw,
1161         .write_raw = ltr501_write_raw,
1162         .attrs = &ltr501_attribute_group,
1163 };
1164
1165 static const struct iio_info ltr501_info = {
1166         .read_raw = ltr501_read_raw,
1167         .write_raw = ltr501_write_raw,
1168         .attrs = &ltr501_attribute_group,
1169         .read_event_value       = &ltr501_read_event,
1170         .write_event_value      = &ltr501_write_event,
1171         .read_event_config      = &ltr501_read_event_config,
1172         .write_event_config     = &ltr501_write_event_config,
1173 };
1174
1175 static const struct iio_info ltr301_info_no_irq = {
1176         .read_raw = ltr501_read_raw,
1177         .write_raw = ltr501_write_raw,
1178         .attrs = &ltr301_attribute_group,
1179 };
1180
1181 static const struct iio_info ltr301_info = {
1182         .read_raw = ltr501_read_raw,
1183         .write_raw = ltr501_write_raw,
1184         .attrs = &ltr301_attribute_group,
1185         .read_event_value       = &ltr501_read_event,
1186         .write_event_value      = &ltr501_write_event,
1187         .read_event_config      = &ltr501_read_event_config,
1188         .write_event_config     = &ltr501_write_event_config,
1189 };
1190
1191 static const struct ltr501_chip_info ltr501_chip_info_tbl[] = {
1192         [ltr501] = {
1193                 .partid = 0x08,
1194                 .als_gain = ltr501_als_gain_tbl,
1195                 .als_gain_tbl_size = ARRAY_SIZE(ltr501_als_gain_tbl),
1196                 .ps_gain = ltr501_ps_gain_tbl,
1197                 .ps_gain_tbl_size = ARRAY_SIZE(ltr501_ps_gain_tbl),
1198                 .als_mode_active = BIT(0) | BIT(1),
1199                 .als_gain_mask = BIT(3),
1200                 .als_gain_shift = 3,
1201                 .info = &ltr501_info,
1202                 .info_no_irq = &ltr501_info_no_irq,
1203                 .channels = ltr501_channels,
1204                 .no_channels = ARRAY_SIZE(ltr501_channels),
1205         },
1206         [ltr559] = {
1207                 .partid = 0x09,
1208                 .als_gain = ltr559_als_gain_tbl,
1209                 .als_gain_tbl_size = ARRAY_SIZE(ltr559_als_gain_tbl),
1210                 .ps_gain = ltr559_ps_gain_tbl,
1211                 .ps_gain_tbl_size = ARRAY_SIZE(ltr559_ps_gain_tbl),
1212                 .als_mode_active = BIT(0),
1213                 .als_gain_mask = BIT(2) | BIT(3) | BIT(4),
1214                 .als_gain_shift = 2,
1215                 .info = &ltr501_info,
1216                 .info_no_irq = &ltr501_info_no_irq,
1217                 .channels = ltr501_channels,
1218                 .no_channels = ARRAY_SIZE(ltr501_channels),
1219         },
1220         [ltr301] = {
1221                 .partid = 0x08,
1222                 .als_gain = ltr501_als_gain_tbl,
1223                 .als_gain_tbl_size = ARRAY_SIZE(ltr501_als_gain_tbl),
1224                 .als_mode_active = BIT(0) | BIT(1),
1225                 .als_gain_mask = BIT(3),
1226                 .als_gain_shift = 3,
1227                 .info = &ltr301_info,
1228                 .info_no_irq = &ltr301_info_no_irq,
1229                 .channels = ltr301_channels,
1230                 .no_channels = ARRAY_SIZE(ltr301_channels),
1231         },
1232 };
1233
1234 static int ltr501_write_contr(struct ltr501_data *data, u8 als_val, u8 ps_val)
1235 {
1236         int ret;
1237
1238         ret = regmap_write(data->regmap, LTR501_ALS_CONTR, als_val);
1239         if (ret < 0)
1240                 return ret;
1241
1242         return regmap_write(data->regmap, LTR501_PS_CONTR, ps_val);
1243 }
1244
1245 static irqreturn_t ltr501_trigger_handler(int irq, void *p)
1246 {
1247         struct iio_poll_func *pf = p;
1248         struct iio_dev *indio_dev = pf->indio_dev;
1249         struct ltr501_data *data = iio_priv(indio_dev);
1250         struct {
1251                 u16 channels[3];
1252                 s64 ts __aligned(8);
1253         } scan;
1254         __le16 als_buf[2];
1255         u8 mask = 0;
1256         int j = 0;
1257         int ret, psdata;
1258
1259         memset(&scan, 0, sizeof(scan));
1260
1261         /* figure out which data needs to be ready */
1262         if (test_bit(0, indio_dev->active_scan_mask) ||
1263             test_bit(1, indio_dev->active_scan_mask))
1264                 mask |= LTR501_STATUS_ALS_RDY;
1265         if (test_bit(2, indio_dev->active_scan_mask))
1266                 mask |= LTR501_STATUS_PS_RDY;
1267
1268         ret = ltr501_drdy(data, mask);
1269         if (ret < 0)
1270                 goto done;
1271
1272         if (mask & LTR501_STATUS_ALS_RDY) {
1273                 ret = regmap_bulk_read(data->regmap, LTR501_ALS_DATA1,
1274                                        als_buf, sizeof(als_buf));
1275                 if (ret < 0)
1276                         return ret;
1277                 if (test_bit(0, indio_dev->active_scan_mask))
1278                         scan.channels[j++] = le16_to_cpu(als_buf[1]);
1279                 if (test_bit(1, indio_dev->active_scan_mask))
1280                         scan.channels[j++] = le16_to_cpu(als_buf[0]);
1281         }
1282
1283         if (mask & LTR501_STATUS_PS_RDY) {
1284                 ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA,
1285                                        &psdata, 2);
1286                 if (ret < 0)
1287                         goto done;
1288                 scan.channels[j++] = psdata & LTR501_PS_DATA_MASK;
1289         }
1290
1291         iio_push_to_buffers_with_timestamp(indio_dev, &scan,
1292                                            iio_get_time_ns(indio_dev));
1293
1294 done:
1295         iio_trigger_notify_done(indio_dev->trig);
1296
1297         return IRQ_HANDLED;
1298 }
1299
1300 static irqreturn_t ltr501_interrupt_handler(int irq, void *private)
1301 {
1302         struct iio_dev *indio_dev = private;
1303         struct ltr501_data *data = iio_priv(indio_dev);
1304         int ret, status;
1305
1306         ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status);
1307         if (ret < 0) {
1308                 dev_err(&data->client->dev,
1309                         "irq read int reg failed\n");
1310                 return IRQ_HANDLED;
1311         }
1312
1313         if (status & LTR501_STATUS_ALS_INTR)
1314                 iio_push_event(indio_dev,
1315                                IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
1316                                                     IIO_EV_TYPE_THRESH,
1317                                                     IIO_EV_DIR_EITHER),
1318                                iio_get_time_ns(indio_dev));
1319
1320         if (status & LTR501_STATUS_PS_INTR)
1321                 iio_push_event(indio_dev,
1322                                IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
1323                                                     IIO_EV_TYPE_THRESH,
1324                                                     IIO_EV_DIR_EITHER),
1325                                iio_get_time_ns(indio_dev));
1326
1327         return IRQ_HANDLED;
1328 }
1329
1330 static int ltr501_init(struct ltr501_data *data)
1331 {
1332         int ret, status;
1333
1334         ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status);
1335         if (ret < 0)
1336                 return ret;
1337
1338         data->als_contr = status | data->chip_info->als_mode_active;
1339
1340         ret = regmap_read(data->regmap, LTR501_PS_CONTR, &status);
1341         if (ret < 0)
1342                 return ret;
1343
1344         data->ps_contr = status | LTR501_CONTR_ACTIVE;
1345
1346         ret = ltr501_read_intr_prst(data, IIO_INTENSITY, &data->als_period);
1347         if (ret < 0)
1348                 return ret;
1349
1350         ret = ltr501_read_intr_prst(data, IIO_PROXIMITY, &data->ps_period);
1351         if (ret < 0)
1352                 return ret;
1353
1354         return ltr501_write_contr(data, data->als_contr, data->ps_contr);
1355 }
1356
1357 static bool ltr501_is_volatile_reg(struct device *dev, unsigned int reg)
1358 {
1359         switch (reg) {
1360         case LTR501_ALS_DATA1:
1361         case LTR501_ALS_DATA1_UPPER:
1362         case LTR501_ALS_DATA0:
1363         case LTR501_ALS_DATA0_UPPER:
1364         case LTR501_ALS_PS_STATUS:
1365         case LTR501_PS_DATA:
1366         case LTR501_PS_DATA_UPPER:
1367                 return true;
1368         default:
1369                 return false;
1370         }
1371 }
1372
1373 static const struct regmap_config ltr501_regmap_config = {
1374         .name =  LTR501_REGMAP_NAME,
1375         .reg_bits = 8,
1376         .val_bits = 8,
1377         .max_register = LTR501_MAX_REG,
1378         .cache_type = REGCACHE_RBTREE,
1379         .volatile_reg = ltr501_is_volatile_reg,
1380 };
1381
1382 static int ltr501_powerdown(struct ltr501_data *data)
1383 {
1384         return ltr501_write_contr(data, data->als_contr &
1385                                   ~data->chip_info->als_mode_active,
1386                                   data->ps_contr & ~LTR501_CONTR_ACTIVE);
1387 }
1388
1389 static const char *ltr501_match_acpi_device(struct device *dev, int *chip_idx)
1390 {
1391         const struct acpi_device_id *id;
1392
1393         id = acpi_match_device(dev->driver->acpi_match_table, dev);
1394         if (!id)
1395                 return NULL;
1396         *chip_idx = id->driver_data;
1397         return dev_name(dev);
1398 }
1399
1400 static int ltr501_probe(struct i2c_client *client,
1401                         const struct i2c_device_id *id)
1402 {
1403         struct ltr501_data *data;
1404         struct iio_dev *indio_dev;
1405         struct regmap *regmap;
1406         int ret, partid, chip_idx = 0;
1407         const char *name = NULL;
1408
1409         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
1410         if (!indio_dev)
1411                 return -ENOMEM;
1412
1413         regmap = devm_regmap_init_i2c(client, &ltr501_regmap_config);
1414         if (IS_ERR(regmap)) {
1415                 dev_err(&client->dev, "Regmap initialization failed.\n");
1416                 return PTR_ERR(regmap);
1417         }
1418
1419         data = iio_priv(indio_dev);
1420         i2c_set_clientdata(client, indio_dev);
1421         data->client = client;
1422         data->regmap = regmap;
1423         mutex_init(&data->lock_als);
1424         mutex_init(&data->lock_ps);
1425
1426         data->reg_it = devm_regmap_field_alloc(&client->dev, regmap,
1427                                                reg_field_it);
1428         if (IS_ERR(data->reg_it)) {
1429                 dev_err(&client->dev, "Integ time reg field init failed.\n");
1430                 return PTR_ERR(data->reg_it);
1431         }
1432
1433         data->reg_als_intr = devm_regmap_field_alloc(&client->dev, regmap,
1434                                                      reg_field_als_intr);
1435         if (IS_ERR(data->reg_als_intr)) {
1436                 dev_err(&client->dev, "ALS intr mode reg field init failed\n");
1437                 return PTR_ERR(data->reg_als_intr);
1438         }
1439
1440         data->reg_ps_intr = devm_regmap_field_alloc(&client->dev, regmap,
1441                                                     reg_field_ps_intr);
1442         if (IS_ERR(data->reg_ps_intr)) {
1443                 dev_err(&client->dev, "PS intr mode reg field init failed.\n");
1444                 return PTR_ERR(data->reg_ps_intr);
1445         }
1446
1447         data->reg_als_rate = devm_regmap_field_alloc(&client->dev, regmap,
1448                                                      reg_field_als_rate);
1449         if (IS_ERR(data->reg_als_rate)) {
1450                 dev_err(&client->dev, "ALS samp rate field init failed.\n");
1451                 return PTR_ERR(data->reg_als_rate);
1452         }
1453
1454         data->reg_ps_rate = devm_regmap_field_alloc(&client->dev, regmap,
1455                                                     reg_field_ps_rate);
1456         if (IS_ERR(data->reg_ps_rate)) {
1457                 dev_err(&client->dev, "PS samp rate field init failed.\n");
1458                 return PTR_ERR(data->reg_ps_rate);
1459         }
1460
1461         data->reg_als_prst = devm_regmap_field_alloc(&client->dev, regmap,
1462                                                      reg_field_als_prst);
1463         if (IS_ERR(data->reg_als_prst)) {
1464                 dev_err(&client->dev, "ALS prst reg field init failed\n");
1465                 return PTR_ERR(data->reg_als_prst);
1466         }
1467
1468         data->reg_ps_prst = devm_regmap_field_alloc(&client->dev, regmap,
1469                                                     reg_field_ps_prst);
1470         if (IS_ERR(data->reg_ps_prst)) {
1471                 dev_err(&client->dev, "PS prst reg field init failed.\n");
1472                 return PTR_ERR(data->reg_ps_prst);
1473         }
1474
1475         ret = regmap_read(data->regmap, LTR501_PART_ID, &partid);
1476         if (ret < 0)
1477                 return ret;
1478
1479         if (id) {
1480                 name = id->name;
1481                 chip_idx = id->driver_data;
1482         } else  if (ACPI_HANDLE(&client->dev)) {
1483                 name = ltr501_match_acpi_device(&client->dev, &chip_idx);
1484         } else {
1485                 return -ENODEV;
1486         }
1487
1488         data->chip_info = &ltr501_chip_info_tbl[chip_idx];
1489
1490         if ((partid >> 4) != data->chip_info->partid)
1491                 return -ENODEV;
1492
1493         indio_dev->info = data->chip_info->info;
1494         indio_dev->channels = data->chip_info->channels;
1495         indio_dev->num_channels = data->chip_info->no_channels;
1496         indio_dev->name = name;
1497         indio_dev->modes = INDIO_DIRECT_MODE;
1498
1499         ret = ltr501_init(data);
1500         if (ret < 0)
1501                 return ret;
1502
1503         if (client->irq > 0) {
1504                 ret = devm_request_threaded_irq(&client->dev, client->irq,
1505                                                 NULL, ltr501_interrupt_handler,
1506                                                 IRQF_TRIGGER_FALLING |
1507                                                 IRQF_ONESHOT,
1508                                                 "ltr501_thresh_event",
1509                                                 indio_dev);
1510                 if (ret) {
1511                         dev_err(&client->dev, "request irq (%d) failed\n",
1512                                 client->irq);
1513                         return ret;
1514                 }
1515         } else {
1516                 indio_dev->info = data->chip_info->info_no_irq;
1517         }
1518
1519         ret = iio_triggered_buffer_setup(indio_dev, NULL,
1520                                          ltr501_trigger_handler, NULL);
1521         if (ret)
1522                 goto powerdown_on_error;
1523
1524         ret = iio_device_register(indio_dev);
1525         if (ret)
1526                 goto error_unreg_buffer;
1527
1528         return 0;
1529
1530 error_unreg_buffer:
1531         iio_triggered_buffer_cleanup(indio_dev);
1532 powerdown_on_error:
1533         ltr501_powerdown(data);
1534         return ret;
1535 }
1536
1537 static int ltr501_remove(struct i2c_client *client)
1538 {
1539         struct iio_dev *indio_dev = i2c_get_clientdata(client);
1540
1541         iio_device_unregister(indio_dev);
1542         iio_triggered_buffer_cleanup(indio_dev);
1543         ltr501_powerdown(iio_priv(indio_dev));
1544
1545         return 0;
1546 }
1547
1548 #ifdef CONFIG_PM_SLEEP
1549 static int ltr501_suspend(struct device *dev)
1550 {
1551         struct ltr501_data *data = iio_priv(i2c_get_clientdata(
1552                                             to_i2c_client(dev)));
1553         return ltr501_powerdown(data);
1554 }
1555
1556 static int ltr501_resume(struct device *dev)
1557 {
1558         struct ltr501_data *data = iio_priv(i2c_get_clientdata(
1559                                             to_i2c_client(dev)));
1560
1561         return ltr501_write_contr(data, data->als_contr,
1562                 data->ps_contr);
1563 }
1564 #endif
1565
1566 static SIMPLE_DEV_PM_OPS(ltr501_pm_ops, ltr501_suspend, ltr501_resume);
1567
1568 static const struct acpi_device_id ltr_acpi_match[] = {
1569         {"LTER0501", ltr501},
1570         {"LTER0559", ltr559},
1571         {"LTER0301", ltr301},
1572         { },
1573 };
1574 MODULE_DEVICE_TABLE(acpi, ltr_acpi_match);
1575
1576 static const struct i2c_device_id ltr501_id[] = {
1577         { "ltr501", ltr501},
1578         { "ltr559", ltr559},
1579         { "ltr301", ltr301},
1580         { }
1581 };
1582 MODULE_DEVICE_TABLE(i2c, ltr501_id);
1583
1584 static struct i2c_driver ltr501_driver = {
1585         .driver = {
1586                 .name   = LTR501_DRV_NAME,
1587                 .pm     = &ltr501_pm_ops,
1588                 .acpi_match_table = ACPI_PTR(ltr_acpi_match),
1589         },
1590         .probe  = ltr501_probe,
1591         .remove = ltr501_remove,
1592         .id_table = ltr501_id,
1593 };
1594
1595 module_i2c_driver(ltr501_driver);
1596
1597 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
1598 MODULE_DESCRIPTION("Lite-On LTR501 ambient light and proximity sensor driver");
1599 MODULE_LICENSE("GPL");